Small dartdoc fixes.

sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.dart

Index: sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.dart
diff --git a/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.dart b/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.dart
index 3c78647e47b276c9cbb939fe44d03161727f2156..837c555f92a2ed2ab3123301c8441cf4b38a83d9 100644
--- a/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.dart
+++ b/sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.dart
@@ -216,10 +216,10 @@ Future<String> compile(Path script,
         new FormattingDiagnosticHandler(provider).diagnosticHandler;
   }
   Uri scriptUri = cwd.resolve(script.toString());
-  Uri libraryUri = cwd.resolve('${libraryRoot}/');

[Johnni Winther, 2013/04/08 13:06:23]

This is not an error, but I want to avoid duplicate slashes in the URIs.

+  Uri libraryUri = cwd.resolve(appendSlash(libraryRoot.toString()));

[ahe, 2013/04/09 08:31:31]

I think I prefer '$foo' over foo.toString().  The latter is guaranteed to return
a string.

   Uri packageUri = null;
   if (packageRoot != null) {
-    packageUri = cwd.resolve('${packageRoot}/');
+    packageUri = cwd.resolve(appendSlash(packageRoot.toString()));
   }
   return api.compile(scriptUri, libraryUri, packageUri,
       provider.readStringFromUri, diagnosticHandler, options);
@@ -240,10 +240,10 @@ Future<MirrorSystem> analyze(List<Path> libraries,
     diagnosticHandler =
         new FormattingDiagnosticHandler(provider).diagnosticHandler;
   }
-  Uri libraryUri = cwd.resolve('${libraryRoot}/');
+  Uri libraryUri = cwd.resolve(appendSlash(libraryRoot.toString()));
   Uri packageUri = null;
   if (packageRoot != null) {
-    packageUri = cwd.resolve('${packageRoot}/');
+    packageUri = cwd.resolve(appendSlash(packageRoot.toString()));
   }
   options = new List<String>.from(options);
   options.add('--analyze-only');